Arizona Corporation Commission grants CEC extension in 2017

On Feb . 6, 2018, the Arizona Corporation Commission (ACC) found it was in the public interest to extend the term of the Certificate of Environmental Compatibility ( CEC ) by 10 years from Oct . 16, 2017 , to Oct . 16, 2027.

Arizona Corporation Commission grants CEC

On Oct. 4, 2012, the ACC voted unanimously (5-0) to confirm the CEC for the Superior-to-Silver King 115 kV line. This was originally authorized for five years, expiring Oct. 16, 2017.

SRP required to obtain CEC

In June 2012, SRP and its consultant, URS Corporation, filed an application for a Certificate of Environmental Compatibility (CEC) with the Arizona Corporation Commission, as required by s tate statute. The CEC application includes environmental studies and a summary of the public outreach activities.

Line Siting Committee recommends CEC

At a public hearing held on Aug . 22, 2012, the Arizona Power Plant and Transmission Line Siting Committee recommended that SRP be granted a CEC.

Superior-to-Silver King 115 kV relocation project

SRP received a request from Resolution Copper Mining, LLC ("Resolution"), a private property owner and SRP customer, to relocate a portion of the existing Superior-to-Silver King 115-kilovolt (kV) transmission line, near the town of Superior.

About the project

The relocation would occur entirely on Resolution's private property. To support this request, SRP will relocate approximately one mile of the existing 115 kV line to the northwest, adjacent and parallel to an existing transmission line corridor.

Arizona Corporation Commission approval

On May 7, 2026, the Arizona Corporation Commission (ACC) granted authorization related to SRP’s request for a 10-year extension of the existing Superior–Silver King Certificate of Environmental Compatibility (CEC). The authorization grants SRP's application to amend the CEC for the Superior to Silver King relocation project to authorize the CEC for an additional 10 years through 2037.

Map

map of the Superior to Silver King Approved line relocation

Certificate of Environmental Compatibility

On Feb. 6, 2018, the Arizona Corporation Commission (ACC) found it was in the public interest to extend the term of the Certificate of Environmental Compatibility (CEC) by 10 years from Oct. 16, 2017, to Oct. 16, 2027.
On Oct. 4, 2012, the ACC voted unanimously (5-0) to confirm the CEC for the Superior-to-Silver King 115 kV line. This was originally authorized for five years, expiring Oct. 16, 2017.
In June 2012, SRP and its consultant, URS Corporation, filed an application for a Certificate of Environmental Compatibility (CEC) with the Arizona Corporation Commission, as required by state statute. The CEC application includes environmental studies and a summary of the public outreach activities.
At a public hearing held on Aug. 22, 2012, the Arizona Power Plant and Transmission Line Siting Committee recommended that SRP be granted a CEC.

CEC filing

Below are links to SRP's application for a Certificate of Environmental Compatibility (CEC) for the proposed Superior-to-Silver King 115 kV relocation project. The document is presented in PDF format, with each link going to a separate section of the application.

Cover	PDF
Table of Contents	PDF
Introduction	PDF
Application for CEC	PDF
Project Location Map	PDF
Apendix A	PDF
Apendix B	PDF
Apendix C	PDF
Biological Evaluation	PDF
Cultural Resources	PDF
EXIBIT A: Project Location and Land Use	PDF
EXIBIT B: Environmental Studies	PDF
EXIBIT C: Biological Wealth	PDF
Full CEC application (30 MB)	PDF

Public outreach

Even though this relocation project is on private property, public outreach and communication about this project were shared using a variety of methods between the months of February 2012 and June 2012.

Stakeholder briefings
SRP held two open houses in Superior on April 17, 2012
Mailer
Agency and tribal notification letters
Newsletter
Project website
Jurisdictional briefings to Pinal County and Superior
Newspaper ad
Presentation from Superior open houses

Contact us

For more information about the project, please call (602) 236-2872(602) 236-2872.